✨ Add PEP 604 style type hint support

[s-weigand]

Currently, PEP 604 style type hints are not supported, because everything after the pipe character (|) gets removed.

E.g. this function

from __future__ import annotations


def function(
    arg1: int,
    arg2: list[str] | dict[str, int] | Thing,
    kwarg1: int = 1
) -> Generator[tuple[str, str]]:

    yield ("abc", "def")

would generate the following docstring

    """[summary]

    :param arg1: [description]
    :type arg1: int
    :param arg2: [description]
    :type arg2: list[str]
    :param kwarg1: [description], defaults to 1
    :type kwarg1: int, optional
    :yield: [description]
    :rtype: Generator[tuple[str, str]]
    """

So one has to manually check and add them back.

[NilsJPWerner]

Thank you for the PR! The code looks good except for two test suggestions.